Electric-light fixture.



1. H. DALE.

ELECTRIC LIGHT FIXTURE. l APPLICATION mm APR. 3. 1915.

,as aan' @mmm JOHN H. DALE, OF NEW YORK, N. Y., ASSIGNOB T DALE LIGHTINGFIXTURE'COIVIPAIW,

. A GORPORATION 0F NEW YORK'.

ELECTRIC-LIGHT FIXTURE.

masacre.

. zen of the United States, residing at the city of New York, in theborough of Manhattan and State of New York, have invented certain newand useful Improvements in Electric-Light'Fixtures, of which thefollowing is a full, clear, and exact description.

This invention relates to electric light fix,

tures for incandescent lamps and has f or its primary object theprovision of means for cooling the lamp and its supporting socket'. Thefixture is therefore especially a plicable for use with nitrogen lamps wich as is well known, after they have remained lighted for a shortperiod, become highly heated and reach a temperature at which the lampbulb and its base, aswell as the supportm socket, are seriously a'ectedand are cause to rapidlydeteriorate.

I Nitrogen lamps, owin to their highcandle power and their bri liancy,are rapidly superseding arc lamps for illuminating large. areas, as instreet lighting, andvmore specifically my. invention contemplates afixture which is suitableA for installations of this character andcomprises a base vand a globe, which, together form a hollowweather-proof casing around the lamp and its supporting socket. Thefixture is provided with ventilating passages through which aircirculates after the inclosed lamp has been lighted fora short period,and the Ventilating passages are preferably arranged so that the lampbulb and the base of the lamp, and the supporting socket are lseparately cooled by air currents which take different paths through thefixture.

The invention also contemplates a novel form of socket in which thethreaded shell and other metallic parts of the lamp socket are exposedto the direct action of air currents which pass through Ventilating passages in the porcelain block or other supporting member for these parts.

Other objects and features of the invention will be brou ht out in thedetailed de-` scription and wil be particularly pointed out in theappended claims.

In the embodiment of the invention illustrated, Figure 1 shows avertical section of the lamp and fixture;

Specification of Letters Patent. i Y Appnation mea april s, 1915. serialNo. 18,890. l

l forl arc lamps.

the usual type and has a flange 4 which,

Patented aan. ea, raie.

Fig. 2 is an enlarged view showing a bottomplan of the novel form ofsocket; and

Fig. 3 is an enlarged central section through the socket at right anglesto the section shown in Fig. 1.

In the embodiment of the invention illustrated, the fixture consistsgenerally of a hollow support or base 1 having at its lower end anannular shade holder 2 which is secured to a spherically-shaped globe 3`of translucent or transparent material, the general outline 'of thefixture being similar to a common type of fixture at present used Theshade holder 2 is of carries a plurality of headed screws 5, thei pointsof which engage the rim 6 of the globe and hold it against displacement.

.The base or support 1 consists of a hollow cylindrical'casing or shell7 over which is secured a dome-shaped piece 8, which is of `greaterdiameter than the shell and fits down a slight distance over the upperedge of the casing to which it is secured by means of pins or rivets 9which carry spacing sleeves 10 to maintain the dome and casingconcentric with an intervening spac between the two through which theair in the interior of thecasing may readily flow.

Fastened to the lower edge of the cylindrical shell is a flaring skirt11, which, at its outer end, is of somewhat greater diameter-than thediameterof the shade holder 2 to which it is secured by 'the relativelylong pins or rivets 12, so as to leave a considerable space between theshade holder and the skirt. Mounted on the pins 12 in the space betweenthe skirt 11 andthe shade or spaces through which air may enter the'interior of the base or support 1. A ventilating opening 16 is alsoprovided in the bottom of the globe 2. y

Mounted in the centrally disposed openthat there is an annular spacebetween the ing in the deflector 15 is a lamp socket comprlsing aporcelain block 17 having laterally disposed lugs 18 at its lower endprovided with openings therein through which the bolts 18 pass to secureit to the deflector. The block 17 which is preferably cylindrical inshape is hollow and is closed at one end by a Wall 17, the other endbeing open to provide a recess or open chamber for the metallic threadedshell 19. The shell 19 which is of the usual construction is supportedin spaced relation to the inner face of the end wall 17 upon posts orpedestals 22 projecting from the end wall 17 into the chamber. Thediameter of the recess or chamber in the porcelain block is alsoconsiderably greater than the threaded shell so rangeds'pacedventilating openings or pas-l sages 23. Ventilating openings -24are also --provided inthe upper end of the shell 19,

the purpose of which will be later described.

The center contact spring of the socket comprises a metallic strip 26which has its ends parallel and bent at substantially right angles toits intermediate portion. to form a substantially Z-shaped piece. (lneend 27 of the spring is secured to the inner face of the end Wall 17',and the other end carries an enlarged head 28 which formsthe centercontact and is centrallydisposed Within the shell 19, the spring passingto the interior of the shell through a suitable opening 28 in its endface. A binding post 29 is positioned in any desired location on thespring to which is secured one of the conductors 30 leading to thesocket, which conductor passes through a centrally disposed opening 31in the socket 17 which also serves as a Ventilating opening. The

metallic shell is electrically connected to the other conductor 32 bymeans of a yokeshaped piece 33 which is positioned within the tln-eaded`shell and has enlarged heads 34 which, together with the shell aresupported by the posts 22, by means of the bolt 21. Projecting from theyoke-shaped piece is an army 35 assing through a suitable opening in thet readed shell to the exterior thereof, which arm carries a-binding post36 to which the electrical conductor is secured.

The form of nitrogen lamp shown is in general similar to the type oflamp which has been adopted and comprises a spherically-shaped bulb 37having an elongated neck 38. The lamp base consisting of the skirt 39and screw plug 40 may be spaced from the neck of the bulb as is shown inmy co-pending applications Serial Nos. 11,983

yMarch 4, 1915 .and 12,298 March 5, 1915.

size to permit the skirt 39 vof the. lamp base to pass therethrough sothat its screw plug may be fitted into the metallic shell 19, the edgeof the wall of the circular opening in the diaphragm being preferablybent upwardly to provide a flange 41 which fits snugly against the skirtof the lamp 'and thus prevents'the passage of air at this point.

The fixture may be suspended or supported in any desired manner as bythe bracket of a lamp post, in which instance, a ring 42 may be providedwhich passes through, the upper narrow end of the dome-shaped piece 8.After the lamp has remained lighted for a short period of time, the heatof/the lamp and its socket will cause a circulation of the air withinthe fixture which will carry away the heat radiating from these partsand therefore prevent them from reaching an excessively hightemperature. This is due to the formation of the Ventilating passagesdescribed, since the air surrounding the lamp bulb 37 and inclosedwithin the globe 3 when heated, rises and passes out through the annularpassage or space between the shadeholder 2 and the diaphragm 14, and thecooler air enters the bottom of the globe through the opening 16. Thecurrent of airwhich is thus produced will maintain the 4lamp bulbrelatively cool. As a part of the heat generated within the lamp bulb iscommunicated to its base; z'. e. the skirt 39 and 'the screw plug 40,the threaded shell 19 as the interior of the globe is directeddownchamber or recess in which it is mounted,

practically the entire surface of the shell is exposed and it willtherefore be prevented from reaching an excessively high temperature.The contact spring 26, as wellV as the contact yoke-piece 33 are alsoexposed to the maaar@ air currents and will therefore also be cooled inthe same manner. The air Will also pass through the interior of theshell 19 above the screw plug l() through the Ventilating openings 24:and 28', so that all metallic parts of the socket are exposed to theconstantly changing air currents.

'Ihe cylindrical block is also cooled by means of the current of airWhich passes into the interior. of the base or support through thepassage-Way between the deflector 15 and the skirt 11.v

While I have shown and described the socket in connection with avspecific form of lighting iXture, yet it is apparent that the socket maybe used alone to advantage or with other forms of fixture, and it is notmy intention to limit the use of the same to the specilic type of ixtureshown, but only by the scope of the appended claims.

I claim 1. A socket for electric lamps comprising a base havingVentilating passages there through, a metallic shell mounted in saidbase having Ventilating passages in communication With said first namedVentilating passages, and a contact mounted in said base and projectinginto said shell.

2. A socket `for electric lamps comprising a base and metallic. shellmounted therein, said base and shell each having Ventilating passagestherein communicating with each other. 3. A socket for electricincandescent lamps comprising a .base having a chamber therein and acentral Ventilating passage in its top communicating with said chamber,a metallic shell mounted in said base having an opening in its topcommunicating with the Walls oi' said chamber and having ventilata.

ing openings therein communicating With the Ventilating openings in saidbase, and a contact mounted in said chamber projecting through anopening in said shell, said opening in said shell being of greater sizethan said contact and communicating with the Ventilating opening in saidbase.

5. A socket for electric lamps comprising a base hav/ing a chamberformed therein, a metallic shell mounted in said chamberin spacedrelation to the Walls thereof, said base having Ventilating passages insaid base communicating With said chamber and'said shell havingVentilating openings therein also communicating With said chamber.

6. A socket for electric lamps comprising4 a base having a chamberformed therein, a metallic shell mounted in said chamber in spacedrelation to the Walls of said chamber,

vVentilating passages in said base communicating With said chamber andother Ventilating openings in said shell communicating with the passagesin said base.

In Witness whereof, I subscribeemy signature, in the presence of aWitness.

JOHN H. DALE. Witness r WALDO M. CHAPIN.

